To send an image in an email

Code snippet to send an image file either inline or as an attachment in java.

import java.util.ResourceBundle;
import java.util.StringTokenizer;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMultipart;

public class MailAttachment {

 private void addAttachments() throws MessagingException {

  /*
   * Here the references are declared in the method, Generally they will
   * be passed into this method where this method gets called
   */
  Multipart multipart = new MimeMultipart();
  String attachmentNames = new String();

  /*
   * Getting the Directory path where the attachment resides on the local
   * system.
   */
  ResourceBundle bundle = ResourceBundle.getBundle("name");
  String attachmentDirectory = bundle.getString("name_of directory")
    + System.getProperty("file.separator");
  StringBuilder strBuilder = new StringBuilder(50);

  /*
   * Here many attachments can be added using a loop, attachmentNames is a
   * String having a value of different attachment file names that are
   * comma separated
   */
  if (!((attachmentNames == null) || (attachmentNames.trim().equals("")))) {
   StringTokenizer tokenizer = new StringTokenizer(attachmentNames,
     ",");
   BodyPart bodypart = null;
   DataSource dataSource = null;
   String currentFileName = null;
   while (tokenizer.hasMoreTokens()) {
    currentFileName = tokenizer.nextToken();
    strBuilder.setLength(0);
    strBuilder.append(attachmentDirectory);
    strBuilder.append(currentFileName);
    bodypart = new MimeBodyPart();

    /*
     * Note: All the headers are to set using addHeader method and
     * not setHeader
     */
    bodypart.addHeader("Content-Type", "text/html");
    /*
     * Here oracle finds  in the generated html
     * content and replaces this with image at run time
     */
    bodypart.addHeader("Content-ID", "<" + currentFileName + ">");

    // Creating DataSource for the file
    dataSource = new FileDataSource(strBuilder.toString());
    bodypart.setDataHandler(new DataHandler(dataSource));
    bodypart.setFileName(currentFileName);

    /*
     * Options to set the file as an attachment or in line with the
     * mail
     */
    bodypart.setDisposition(MimeBodyPart.INLINE);
    multipart.addBodyPart(bodypart);
   }
  }
 }

}